my yb are trained to the 1 hour system from the 1st time they wander out onto the landing board as soon as out the trap is closed and they arent allowed back in until exactly 1 hr later with 1 sharp whisle and fed this is done twice a day as they begin to grow and fly out of site they know they aint getting in for 1hr till feeding as soon as whistle sounds i have found once ranging they return almost on the hour and trap immediatly falling over each other to get through the bobs works for me and works for them